diff options
Diffstat (limited to 'drivers/scsi/ibmvscsi/ibmvfc.c')
| -rw-r--r-- | drivers/scsi/ibmvscsi/ibmvfc.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c index eb702b96d57c..c4a7c06793c5 100644 --- a/drivers/scsi/ibmvscsi/ibmvfc.c +++ b/drivers/scsi/ibmvscsi/ibmvfc.c @@ -3819,6 +3819,20 @@ static int ibmvfc_remove(struct vio_dev *vdev) return 0; } +/** + * ibmvfc_get_desired_dma - Calculate DMA resources needed by the driver + * @vdev: vio device struct + * + * Return value: + * Number of bytes the driver will need to DMA map at the same time in + * order to perform well. + */ +static unsigned long ibmvfc_get_desired_dma(struct vio_dev *vdev) +{ + unsigned long pool_dma = max_requests * sizeof(union ibmvfc_iu); + return pool_dma + ((512 * 1024) * driver_template.cmd_per_lun); +} + static struct vio_device_id ibmvfc_device_table[] __devinitdata = { {"fcp", "IBM,vfc-client"}, { "", "" } @@ -3829,6 +3843,7 @@ static struct vio_driver ibmvfc_driver = { .id_table = ibmvfc_device_table, .probe = ibmvfc_probe, .remove = ibmvfc_remove, + .get_desired_dma = ibmvfc_get_desired_dma, .driver = { .name = IBMVFC_NAME, .owner = THIS_MODULE, |